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DE-102014218721-B4 - Commercial vehicle tires

DE102014218721B4DE 102014218721 B4DE102014218721 B4DE 102014218721B4DE-102014218721-B4

Abstract

Commercial vehicle tires of radial construction with a belt (3) of at least three layers, which, viewed from radially inner to radially outer, has at least one locking layer (5) and two working layers (6, 7), wherein the first, radially inner working layer (6) is the widest belt layer and is wider than the second, radially outer working layer (7), and the second, radially outer working layer (7) is at least as wide as the locking layer (5), wherein the working layers (6, 7) contain reinforcing elements, in particular made of steel cord, which in each working layer (6, 7) run parallel to each other and at an angle of 15° to 24° to the circumferential direction of the tire, wherein the reinforcing elements in one working layer (6, 7) intersect the reinforcing elements in the other working layer (6, 7), wherein at least the edges of the second, radially outer working layer (7) are each covered by an edge reinforcement strip (9, 9', 9'') which is embedded in rubber and runs parallel to each other contains reinforcement elements characterized by that the strength carriers of the edge reinforcement strip (9, 9', 9'') are hybrid cords running at an acute angle of 15° to 30° to the circumferential direction, each consisting of at least one high-modulus yarn and one low-modulus yarn, where the force, normalized to the yarn fineness in tex, which must be applied to the high-modulus yarn, is > 300 mN/tex at 1% elongation and > 500 mN/tex at 2% elongation and where the force that must be applied to the low-modulus yarn, normalized to the yarn fineness in tex, is < 150 mN/tex at 1% elongation and < 200 mN/tex at 2% elongation.

Inventors

  • Anastassia Astafieva
  • Wolfgang Reese
  • Seyedomidreza Biabanaki

Assignees

  • CONTINENTAL REIFEN DEUTSCHLAND GMBH

Dates

Publication Date
20260513
Application Date
20140918

Claims (14)

  1. Commercial vehicle tires of radial construction with a belt (3) of at least three layers, which, viewed from radially inner to radially outer, has at least one locking layer (5) and two working layers (6, 7), wherein the first, radially inner working layer (6) is the widest belt layer and is wider than the second, radially outer working layer (7), and the second, radially outer working layer (7) is at least as wide as the locking layer (5), wherein the working layers (6, 7) contain reinforcing elements, in particular made of steel cord, which in each working layer (6, 7) run parallel to each other and at an angle of 15° to 24° to the circumferential direction of the tire, wherein the reinforcing elements in one working layer (6, 7) intersect the reinforcing elements in the other working layer (6, 7), wherein at least the edges of the second, radially outer working layer (7) are each covered by an edge reinforcement strip (9, 9', 9'') which is embedded in rubber and runs parallel to each other containing reinforcing elements, characterized by the fact that the reinforcing elements of the edge reinforcement strip (9, 9', 9'') are hybrid cords running at an acute angle of 15° to 30° to the circumferential direction, each consisting of at least one high-modulus yarn and one low-modulus yarn, where the force, normalized to the yarn count in tex, that must be applied to the high-modulus yarn is > 300 mN/tex at 1% elongation and > 500 mN/tex at 2% elongation, and where the force, normalized to the yarn count in tex, that must be applied to the low-modulus yarn is < 150 mN/tex at 1% elongation and < 200 mN/tex at 2% elongation.
  2. Commercial vehicle tires Claim 1 , characterized in that the edge reinforcement strip (9', 9'') covers the edge of the second, radially outer working layer (7) with an overlap width (b'') on this working layer (7) of at least 10 mm.
  3. Commercial vehicle tires Claim 1 or 2 , characterized in that the edge reinforcement strip (9'') only covers the edge of the second, radially outer working layer (7), wherein the edge reinforcement strip (9'') extends on the first, radially inner working layer (6) at most to the edge of this working layer (6).
  4. Commercial vehicle tires Claim 1 or 2 , characterized in that the edge reinforcement strip (9, 9') covers the edges of both working layers (6, 7).
  5. Commercial vehicle tires with a four-ply belt (3) according to Claim 1 , characterized in that the edge reinforcement strip (9) covers the edges of the two working layers (6, 7) and a fourth belt layer (8), wherein its covering width (b) on the fourth belt layer (8) is at least 10 mm.
  6. Commercial vehicle tires Claim 5 , characterized in that the overlap width (b) on the fourth belt layer (8) is up to 15 mm.
  7. Commercial vehicle tires according to one of the Claims 4 until 6 , characterized in that the edge reinforcement strip (9, 9') extends beyond the edge of the first, radially inner working layer (6) by 5 mm to 15 mm.
  8. Commercial vehicle tires according to one of the Claims 1 until 7 characterized in that the high-modulus yarn in the hybrid cord consists of filaments made of aramid, glass or carbon.
  9. Commercial vehicle tires according to one of the Claims 1 until 8 , characterized in that the low-modulus yarn in the hybrid cord consists of filaments made of polyamide, in particular PA 6.6 or PA 6, or of PET.
  10. Commercial vehicle tires according to one of the Claims 1 until 9 , characterized in that the high-modulus yarn has a fineness of 1500 dtex to 1800 dtex, in particular of 1600 dtex to 1700 dtex.
  11. Commercial vehicle tires according to one of the Claims 1 until 10 , characterized in that the low-modulus yarn has a fineness of 1200 dtex to 1600 dtex, in particular of 1350 dtex to 1450 dtex.
  12. Commercial vehicle tires according to one of the Claims 1 until 11 , characterized in that the hybrid cord consists of two high-modulus yarns twisted together and one low-modulus yarn twisted together with the high-modulus yarns twisted together.
  13. Commercial vehicle tires according to one of the Claims 1 until 12 characterized by the fact that the Hybrid cords run in the edge reinforcement strips (9, 9', 9'') in the circumferential direction of the tire.
  14. Commercial vehicle tires according to one of the Claims 1 until 13 , characterized in that the inclination of the hybrid cords relative to the circumferential direction corresponds to the inclination of the reinforcing elements in the radially outer working position (7).

Description

The invention relates to a commercial vehicle tire of radial construction with a belt of at least three layers, which, viewed from radially inside to radially outside, has at least one locking layer and two working layers, wherein the first, radially inner working layer is the widest belt layer and is wider than the second, radially outer working layer, and the second, radially outer working layer is at least as wide as the locking layer, wherein the working layers contain reinforcing elements, in particular made of steel cord, which in each working layer run parallel to each other and at an angle of 15° to 24° to the circumferential direction of the tire, wherein the reinforcing elements in one working layer cross the reinforcing elements in the other working layer, wherein at least the edges of the second, radially outer working layer are each covered by an edge reinforcement strip which contains reinforcing elements embedded in rubber and running parallel to each other. Radial tires for commercial vehicles, especially trucks or buses, have a belt with at least two, and in particular a belt with four, layers. In a so-called triangular belt consisting of four layers, the reinforcing elements in the first, radially innermost layer typically form an angle of approximately 45° to 65° with the circumferential direction. In the two working layers, the reinforcing elements run at angles of 15° to 24° to the circumferential direction. The fourth layer, the radially outermost layer, is the so-called protective layer, whose reinforcing elements run circumferentially or at an acute angle to the circumferential direction. It is known that the service life of commercial vehicle tires can be affected by the continuous stresses in the area of the belt edges, as the belt ply edges possess a certain degree of mobility. This can lead to cracks in the surrounding rubber material in the belt edge areas and to separation of the belt edges. Attempts have therefore been made to implement appropriate measures to reduce the mobility of the belt edges, for example, by selecting the spacing of the reinforcing elements in the working layers, by adjusting the belt ply widths and reinforcing element angles, and by installing shoulder pads or belt edge pads. To further reduce the mobility of the belt edges, it is also known to cover the edge areas of the working layers with a strip of rubberized polyamide cords, for example, PA 6.6 or PA6, running circumferentially around the tire. PA 6.6 is a low-modulus material with a tensile strength-elongation behavior that is not very favorable for this application. The known nylon strips were therefore unable to influence the mobility of the edges of the working layers to the desired extent. A commercial vehicle tire of the type mentioned above is, for example, made from the DE 693 05 211 T2 This commercial vehicle tire is known. It has a four-ply belt with a barrier layer, a first, radially inner working layer, a second, radially outer working layer, and a protective layer. The radially inner working layer is the widest belt layer. The second, radially outer working layer is as wide as the barrier layer. The working layers contain steel or aramid cords running at an angle of 17° to 27° to the circumferential direction. The edges of the second, radially outer working layer are each covered by an edge reinforcement strip, which consists of cords of steel, aramid, nylon, polyester, or polyalkylene embedded in rubber, running parallel to each other and at an angle of 0° to 55° to the circumferential direction (0° to 5° in the exemplary embodiment), with nylon cord being preferred. The edge reinforcement strips reduce stresses in the area of the belt edges by restricting growth in the tire shoulders or by distributing the stresses over a larger area. The DE 694 03 315 T2 Disclosing a vehicle tire with a belt and a belt bandage, the belt comprises two equally wide belt layers made of aramid cords. The belt bandage includes two outer bandage sections and a central bandage section that extends over the radially outer belt layer and the two outer bandage sections, terminating at the belt edges of the belt layers. Each bandage section contains a hybrid cord running at an angle of 0° to 3° to the circumferential direction and consisting of at least one yarn with a high modulus of elasticity, such as an aramid fiber, a polyvinyl alcohol fiber, a carbon fiber, or a glass fiber, and at least one yarn with a low modulus of elasticity, such as an aliphatic polyamide fiber, like nylon. These hybrid cords are intended to influence the behavior of the vehicle tire during molding in the vulcanization mold in such a way that tire expansion during high-speed driving is reduced, thus providing a lightweight tire with good high-speed durability. Furthermore, it is from the DE 10 2012 217 332 A1 A run-flat pneumatic tire is known with crescent-shaped inner rubber layers installed in the sidewall area to absorb the load